Android 从下往上弹出 DialogFragment 的关键代码

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//java代码： public class CountrySelectDialog extends AppCompatDialogFragment{     public static CountrySelectDialog newInstance() {     Bundle args = new Bundle();     CountrySelectDialog fragment = new CountrySelectDialog();     fragment.setArguments(args);     return fragment;   }     @Override   public void onStart() {     super.onStart();     setStyle(AppCompatDialogFragment.STYLE_NORMAL, R.style.BottomDialog);//设置自定义style       Window window = getDialog().getWindow();     window.setBackgroundDrawable(null);//必须的     WindowManager.LayoutParams lp = window.getAttributes();     lp.gravity = Gravity.BOTTOM;//在下边     lp.width = WindowManager.LayoutParams.MATCH_PARENT;     window.setAttributes(lp);       getDialog().setOnDismissListener(dialog -> {         //todo，关闭dialog的回调监听       }     });     }     @Override   public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,       @Nullable Bundle savedInstanceState) {     return inflater.inflate(R.layout.xxx, container, false);   }     public void show(FragmentManager supportFragmentManager) {     show(supportFragmentManager, getClass().getName());     setStyle(AppCompatDialogFragment.STYLE_NORMAL, R.style.BottomDialog);//show的时候设置，不然第一次style无效   }   }     //styles.xml代码： <style name="BottomDialog" parent="Theme.AppCompat.Light.Dialog">   <item name="android:windowAnimationStyle">@style/BottomDialogAnimation</item> </style>   <style name="BottomDialogAnimation">   <item name="android:windowEnterAnimation">@anim/bottom_dialog_in</item>   <item name="android:windowExitAnimation">@anim/bottom_dialog_out</item> </style>     // res/anim/bottom_dialog_in.xml <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"   android:interpolator="@android:anim/accelerate_interpolator"   >   <translate     android:duration="300"     android:fillAfter="true"     android:fromXDelta="0"     android:fromYDelta="100%"     android:toXDelta="0"     android:toYDelta="0">     </translate>   <alpha     android:duration="300"     android:fromAlpha="0.0"     android:toAlpha="1.0"/> </set>   // res/anim/bottom_dialog_out.xml <?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android"   android:interpolator="@android:anim/accelerate_interpolator">   <translate     android:duration="300"     android:fillAfter="true"     android:fromXDelta="0"     android:fromYDelta="0"     android:toXDelta="0"     android:toYDelta="100%">     </translate>   <alpha     android:duration="300"     android:fromAlpha="1.0"     android:toAlpha="0.0"/> </set>